Json
Javascript Json和数组之间的转换
JSON.stringify（）：Javascript对象序列化为JSON字符串
JSON.parse（）：JSON字符串转换为原生的Javascript的值
<script type="text/javascript"> function ToJson() { var book = { title: "professional jacascript", authors: ["Nicholas C. Zakas"], edition: 3, year: 2011 }; var jsontext = JSON.stringify(book); alert("1个参数的序列化结果:"+jsontext); var jsontext2 = JSON.stringify(book, ["title","edition"]); alert("2个参数的序列化结果,带有过滤器:" + jsontext2); var jsontext3 = JSON.stringify(book, ["title", "edition"],10); alert("2个参数的序列化结果,带有过滤器和缩进:" + jsontext3); var bookCopy = JSON.parse(jsontext); alert("title:" + bookCopy.title); alert("authors:" + bookCopy.authors); } </script>
c# Json序列化和反序列化
JSON 序列化和反序列化——.net3.5自带类库实现 .net3.5提供了json对象序列化与反序列化的类。
位置在：System.Runtime.Serialization.Json空间下。
其中如果要应用这个空间还必须添加对
System.ServiceModel
System.ServiceModel.Web
这两个库文件的引用。这两个库文件在.Net3.5版本之后才在vs中存在，之前的.Framwork2.0等版本要先下载这两个库文件的dll。
在使用时，System.Runtime.Serialization的Frameword库版本要和System.ServiceModel、System.ServiceModel.Web的库版本相同
这样才可以使用DataContractJsonSerializer 类
参考实体类：Customer
public class Customer
{
public int Unid { get; set; }
public string CustomerName { get; set; }
}
DataContractJsonSerializer
将对象序列化为 JavaScript 对象表示法 (JSON)，并将 JSON 数据反序列化为对象。无法继承此类。
其中有个方法WriteObject，它的功能定义为：将对象序列化为 JavaScript 对象表示法 (JSON) 文档
它有三个方法重载，其中一个为：
public override void WriteObject(Stream stream,Object graph)
它的功能描述这：将指定对象序列化为 JavaScript 对象表示法 (JSON) 数据，并将生成的 JSON 写入流中
（一）序列化
public string ToJson<T>(T t)
{
DataContractJsonSerializer ds = new DataContractJsonSerializer(typeof(T));
MemoryStream ms = new MemoryStream();
ds.WriteObject(ms, t);
string strReturn = Encoding.UTF8.GetString(ms.ToArray());
ms.Close();
return strReturn;
}
测试：
Customer cc = new Customer {Unid=1,CustomerName="John" };
string strJsons = ToJson<Customer>(cc);
Console.WriteLine(strJsons);
结果为：{"CustomerName":"John","Unid":1}
（二）反序列化
ReadObject方法，其描述为：反序列化 JSON（JavaScript 对象表示法）数据，并返回反序列化的对象。
它有很多重载，现在通过一种：
public override Object ReadObject(Stream stream)
它从流中得到反序列化的对象。
public T FromJson<T>(string strJson) where T:class
{
DataContractJsonSerializer ds = new DataContractJsonSerializer(typeof(T));
MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(strJson));
return ds.ReadObject(ms) as T;
}
测试：
string strJson="{\"CustomerName\":\"John\",\"Unid\":1}";
Customer c = FromJson<Customer>(strJson);
Console.WriteLine(c.Unid+" "+c.CustomerName);
using System; using System.Collections.Generic; using System.Web; using System.Data; using System.Text; using System.Data.Common; using System.Collections; using System.Reflection; using System.Text.RegularExpressions; namespace DAL { /// <summary> ///JsonHelper 的摘要说明 /// </summary> public static class JsonHelper { #region 转化成Json字符串方法 #region 通用方法 /// <summary> /// 格式化字符型、日期型、布尔型 /// </summary> public static string StringFormat(string str, Type type) { if (type == typeof(string)) { str = StringFilter(str); str = "\"" + str + "\""; } else if (type == typeof(DateTime) || type == typeof(DateTime?)) { str = "\"" + str + "\""; } else if (type == typeof(bool)) { str = str.ToLower(); } else if (type == typeof(Guid)) { str = "\"" + str + "\""; } else if (type != typeof(string) && string.IsNullOrEmpty(str)) { str = "\"" + str + "\""; } return str; } /// <summary> /// 过滤字符串 /// </summary> public static string StringFilter(string str) { StringBuilder sb = new StringBuilder(); for (int i = 0; i < str.Length; i++) { char c = str.ToCharArray()[i]; switch (c) { case '\"': sb.Append("\\\""); break; case '\\': sb.Append("\\\\"); break; case '/': sb.Append("\\/"); break; case '\b': sb.Append("\\b"); break; case '\f': sb.Append("\\f"); break; case '\n': sb.Append("\\n"); break; case '\r': sb.Append("\\r"); break; case '\t': sb.Append("\\t"); break; default: sb.Append(c); break; } } return sb.ToString(); } #endregion #region 列转json /// <summary> /// 列转json /// </summary> /// <param name="dt">表</param> /// <param name="r">列</param> public static string ColumnToJson(DataTable dt, int r) { StringBuilder strSql = new StringBuilder(); for (int i = 0; i < dt.Rows.Count; i++) { strSql.Append(dt.Rows[i][r]); strSql.Append(","); } return strSql.ToString().Trim(','); } #endregion #region 对象转json /// <summary> /// 对象转json /// </summary> public static string ToJson(object jsonObject) { StringBuilder sb = new StringBuilder(); sb.Append("{"); PropertyInfo[] propertyInfo = jsonObject.GetType().GetProperties(); for (int i = 0; i < propertyInfo.Length; i++) { object objectValue = propertyInfo[i].GetGetMethod().Invoke(jsonObject, null); Type type = propertyInfo[i].PropertyType; string strValue = objectValue.ToString(); strValue = StringFormat(strValue, type); sb.Append("\"" + propertyInfo[i].Name + "\":"); sb.Append(strValue + ","); } sb.Remove(sb.Length - 1, 1); sb.Append("}"); return sb.ToString(); } #endregion #region list转json /// <summary> /// list转json /// </summary> public static string ListToJson<T>(IList<T> list) { object obj = list[0]; return ListToJson<T>(list, obj.GetType().Name); } private static string ListToJson<T>(IList<T> list, string JsonName) { StringBuilder Json = new StringBuilder(); if (string.IsNullOrEmpty(JsonName)) JsonName = list[0].GetType().Name; Json.Append("{\"" + JsonName + "\":["); if (list.Count > 0) { for (int i = 0; i < list.Count; i++) { T obj = Activator.CreateInstance<T>(); PropertyInfo[] pi = obj.GetType().GetProperties(); Json.Append("{"); for (int j = 0; j < pi.Length; j++) { Type type = pi[j].GetValue(list[i], null).GetType(); Json.Append("\"" + pi[j].Name.ToString() + "\":" + StringFormat(pi[j].GetValue(list[i], null).ToString(), type)); if (j < pi.Length - 1) { Json.Append(","); } } Json.Append("}"); if (i < list.Count - 1) { Json.Append(","); } } } Json.Append("]}"); return Json.ToString(); } #endregion #region 对象集合转换为json /// <summary> /// 对象集合转换为json /// </summary> /// <param name="array">对象集合</param> /// <returns>json字符串</returns> public static string ToJson(IEnumerable array) { string jsonString = "["; foreach (object item in array) { jsonString += ToJson(item) + ","; } jsonString = jsonString.Substring(0, jsonString.Length - 1); return jsonString + "]"; } #endregion #region 普通集合转换Json /// <summary> /// 普通集合转换Json /// </summary> /// <param name="array">集合对象</param> /// <returns>Json字符串</returns> public static string ToArrayString(IEnumerable array) { string jsonString = "["; foreach (object item in array) { jsonString = ToJson(item.ToString()) + ","; } jsonString.Remove(jsonString.Length - 1, jsonString.Length); return jsonString + "]"; } #endregion #region DataSet转换为Json /// <summary> /// DataSet转换为Json /// </summary> /// <param name="dataSet">DataSet对象</param> /// <returns>Json字符串</returns> public static string ToJson(DataSet dataSet) { string jsonString = "{"; foreach (DataTable table in dataSet.Tables) { jsonString += "\"" + table.TableName + "\":" + ToJson(table) + ","; } jsonString = jsonString.TrimEnd(','); return jsonString + "}"; } #endregion #region Datatable转换为Json /// <summary> /// Datatable转换为Json /// </summary> public static string ToJson(DataTable dt) { if (dt.Rows.Count > 0) { StringBuilder jsonString = new StringBuilder(); jsonString.Append("["); DataRowCollection drc = dt.Rows; for (int i = 0; i < drc.Count; i++) { jsonString.Append("{"); for (int j = 0; j < dt.Columns.Count; j++) { string strKey = dt.Columns[j].ColumnName; string strValue = drc[i][j].ToString(); Type type = dt.Columns[j].DataType; jsonString.Append("\"" + strKey + "\":"); strValue = StringFormat(strValue, type); if (j < dt.Columns.Count - 1) jsonString.Append(strValue + ","); else jsonString.Append(strValue); } jsonString.Append("},"); } jsonString.Remove(jsonString.Length - 1, 1); jsonString.Append("]"); return jsonString.ToString(); } else return "[]"; } /// <summary> /// DataTable转换为Json /// </summary> public static string ToJson(DataTable dt, string jsonName) { StringBuilder Json = new StringBuilder(); if (string.IsNullOrEmpty(jsonName)) jsonName = dt.TableName; Json.Append("{\"" + jsonName + "\":["); if (dt.Rows.Count > 0) { for (int i = 0; i < dt.Rows.Count; i++) { Json.Append("{"); for (int j = 0; j < dt.Columns.Count; j++) { Type type = dt.Rows[i][j].GetType(); Json.Append("\"" + dt.Columns[j].ColumnName.ToString() + "\":" + StringFormat(dt.Rows[i][j].ToString(), type)); if (j < dt.Columns.Count - 1) Json.Append(","); } Json.Append("}"); if (i < dt.Rows.Count - 1) Json.Append(","); } } Json.Append("]}"); return Json.ToString(); } #endregion #region DataReader转换为Json /// <summary> /// DataReader转换为Json /// </summary> /// <param name="dataReader">DataReader对象</param> /// <returns>Json字符串</returns> public static string ToJson(DbDataReader dataReader) { StringBuilder jsonString = new StringBuilder(); jsonString.Append("["); while (dataReader.Read()) { jsonString.Append("{"); for (int i = 0; i < dataReader.FieldCount; i++) { Type type = dataReader.GetFieldType(i); string strKey = dataReader.GetName(i); string strValue = dataReader[i].ToString(); jsonString.Append("\"" + strKey + "\":"); strValue = StringFormat(strValue, type); if (i < dataReader.FieldCount - 1) jsonString.Append(strValue + ","); else jsonString.Append(strValue); } jsonString.Append("},"); } dataReader.Close(); jsonString.Remove(jsonString.Length - 1, 1); jsonString.Append("]"); return jsonString.ToString(); } #endregion #region 返回错误 public static string error() { DataTable dt = new DataTable(); dt.Columns.Add("error", typeof(int)); DataRow dr = dt.NewRow(); dr["error"] = 1; dt.Rows.Add(dr); return ToJson(dt); } #endregion #endregion #region Json字符串转化成其它方法 /// <summary> /// 将json转换为DataTable /// </summary> /// <param name="strJson">得到的json</param> /// <returns></returns> public static DataTable JsonToDataTable(string strJson) { //转换json格式 strJson = strJson.Replace(",\"", "*\"").Replace("\":", "\"#").ToString(); //取出表名 var rg = new Regex(@"(?<={)[^:]+(?=:\[)", RegexOptions.IgnoreCase); string strName = rg.Match(strJson).Value; DataTable tb = null; //去除表名 strJson = strJson.Substring(strJson.IndexOf("[") + 1); strJson = strJson.Substring(0, strJson.IndexOf("]")); //获取数据 rg = new Regex(@"(?<={)[^}]+(?=})"); MatchCollection mc = rg.Matches(strJson); for (int i = 0; i < mc.Count; i++) { string strRow = mc[i].Value; string[] strRows = strRow.Split('*'); //创建表 if (tb == null) { tb = new DataTable(); tb.TableName = strName; foreach (string str in strRows) { var dc = new DataColumn(); string[] strCell = str.Split('#'); if (strCell[0].Substring(0, 1) == "\"") { int a = strCell[0].Length; dc.ColumnName = strCell[0].Substring(1, a - 2); } else { dc.ColumnName = strCell[0]; } tb.Columns.Add(dc); } tb.AcceptChanges(); } //增加内容 DataRow dr = tb.NewRow(); for (int r = 0; r < strRows.Length; r++) { dr[r] = strRows[r].Split('#')[1].Trim().Replace("，", ",").Replace("：", ":").Replace("\"", ""); } tb.Rows.Add(dr); tb.AcceptChanges(); } return tb; } #endregion } }